That depends entirely on how sneaky and unscrupulous you’re willing to be lol

I’m sorry you’re dealing with this, it’s a shitty place to be. Personally I’ve had friends have some success with anti-cult/anti-brainsashing techniques but even when done under ideal conditions with people in obvious and outright cults it can fail. The human brain really just is wired in such a way cult think can genuinely hijack it